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diff --git a/source/application/hal/hal.c b/source/application/hal/hal.c
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+/*
+ * Copyright (c) 2021 Arm Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "hal.h" /* API */
+
+#include "hal_config.h" /* HAL configuration */
+#include "system_init.h"
+
+#include <stdio.h>
+#include <assert.h>
+
+#if defined(ARM_NPU)
+
+#include "ethosu_driver.h" /* Arm Ethos-U55 driver header */
+#include "timing_adapter.h" /* Arm Ethos-U55 timing adapter driver header */
+#include "timing_adapter_settings.h" /* Arm Ethos-U55 timing adapter settings */
+
+/**
+ * @brief Initialises the Arm Ethos-U55 NPU
+ * @return 0 if successful, error code otherwise
+ **/
+static int _arm_npu_init(void);
+
+#endif /* ARM_NPU */
+
+int hal_init(hal_platform* platform, data_acq_module* data_acq,
+ data_psn_module* data_psn, platform_timer* timer)
+{
+ assert(platform && data_acq && data_psn);
+
+ platform->data_acq = data_acq;
+ platform->data_psn = data_psn;
+ platform->timer = timer;
+ platform->platform_init = system_init;
+ platform->platform_release = system_release;
+ system_name(platform->plat_name, sizeof(platform->plat_name));
+
+ return 0;
+}
+
+/**
+ * @brief Local helper function to clean the slate for current platform.
+ **/
+static void _hal_platform_clear(hal_platform* platform)
+{
+ assert(platform);
+ platform->inited = 0;
+}
+
+int hal_platform_init(hal_platform* platform)
+{
+ int state;
+ assert(platform && platform->platform_init);
+ _hal_platform_clear(platform);
+
+ /* Initialise platform */
+ if (0 != (state = platform->platform_init())) {
+ printf_err("failed to initialise platform %s\n", platform->plat_name);
+ return state;
+ }
+
+ /* Initialise the data acquisition module */
+ if (0 != (state = data_acq_channel_init(platform->data_acq))) {
+ if (!platform->data_acq->inited) {
+ printf_err("failed to initialise data acq module: %s\n",
+ platform->data_acq->system_name);
+ }
+ hal_platform_release(platform);
+ return state;
+ }
+
+ /* Initialise the presentation module */
+ if (0 != (state = data_psn_system_init(platform->data_psn))) {
+ printf_err("failed to initialise data psn module: %s\n",
+ platform->data_psn->system_name);
+ data_acq_channel_release(platform->data_acq);
+ hal_platform_release(platform);
+ return state;
+ }
+
+#if defined(ARM_NPU)
+
+ /* If Arm Ethos-U55 NPU is to be used, we initialise it here */
+ if (0 != (state = _arm_npu_init())) {
+ return state;
+ }
+
+#endif /* ARM_NPU */
+
+ /* followed by the timer module */
+ init_timer(platform->timer);
+
+ info("%s platform initialised\n", platform->plat_name);
+ debug("using %s module for data acquisition\n",
+ platform->data_acq->system_name);
+ debug("using %s module for data presentation\n",
+ platform->data_psn->system_name);
+
+ platform->inited = !state;
+
+ return state;
+}
+
+void hal_platform_release(hal_platform *platform)
+{
+ assert(platform && platform->platform_release);
+ data_acq_channel_release(platform->data_acq);
+ data_psn_system_release(platform->data_psn);
+
+ _hal_platform_clear(platform);
+ info("releasing platform %s\n", platform->plat_name);
+ platform->platform_release();
+}
+
+#if defined(ARM_NPU)
+/**
+ * @brief Defines the Ethos-U interrupt handler: just a wrapper around the default
+ * implementation.
+ **/
+static void _arm_npu_irq_handler(void)
+{
+ /* Call the default interrupt handler from the NPU driver */
+ ethosu_irq_handler();
+}
+
+/**
+ * @brief Initialises the NPU IRQ
+ **/
+static void _arm_npu_irq_init(void)
+{
+ const IRQn_Type ethosu_irqnum = (IRQn_Type)EthosU_IRQn;
+
+ /* Register the EthosU IRQ handler in our vector table.
+ * Note, this handler comes from the EthosU driver */
+ NVIC_SetVector(ethosu_irqnum, (uint32_t)_arm_npu_irq_handler);
+
+ /* Enable the IRQ */
+ NVIC_EnableIRQ(ethosu_irqnum);
+
+ debug("EthosU IRQ#: %u, Handler: 0x%p\n",
+ ethosu_irqnum, _arm_npu_irq_handler);
+}
+
+static int _arm_npu_timing_adapter_init(void)
+{
+#if defined (TA0_BASE)
+ struct timing_adapter ta_0;
+ struct timing_adapter_settings ta_0_settings = {
+ .maxr = TA0_MAXR,
+ .maxw = TA0_MAXW,
+ .maxrw = TA0_MAXRW,
+ .rlatency = TA0_RLATENCY,
+ .wlatency = TA0_WLATENCY,
+ .pulse_on = TA0_PULSE_ON,
+ .pulse_off = TA0_PULSE_OFF,
+ .bwcap = TA0_BWCAP,
+ .perfctrl = TA0_PERFCTRL,
+ .perfcnt = TA0_PERFCNT,
+ .mode = TA0_MODE,
+ .maxpending = 0, /* This is a read-only parameter */
+ .histbin = TA0_HISTBIN,
+ .histcnt = TA0_HISTCNT
+ };
+
+ if (0 != ta_init(&ta_0, TA0_BASE)) {
+ printf_err("TA0 initialisation failed\n");
+ return 1;
+ }
+
+ ta_set_all(&ta_0, &ta_0_settings);
+#endif /* defined (TA0_BASE) */
+
+#if defined (TA1_BASE)
+ struct timing_adapter ta_1;
+ struct timing_adapter_settings ta_1_settings = {
+ .maxr = TA1_MAXR,
+ .maxw = TA1_MAXW,
+ .maxrw = TA1_MAXRW,
+ .rlatency = TA1_RLATENCY,
+ .wlatency = TA1_WLATENCY,
+ .pulse_on = TA1_PULSE_ON,
+ .pulse_off = TA1_PULSE_OFF,
+ .bwcap = TA1_BWCAP,
+ .perfctrl = TA1_PERFCTRL,
+ .perfcnt = TA1_PERFCNT,
+ .mode = TA1_MODE,
+ .maxpending = 0, /* This is a read-only parameter */
+ .histbin = TA1_HISTBIN,
+ .histcnt = TA1_HISTCNT
+ };
+
+ if (0 != ta_init(&ta_1, TA1_BASE)) {
+ printf_err("TA1 initialisation failed\n");
+ return 1;
+ }
+
+ ta_set_all(&ta_1, &ta_1_settings);
+#endif /* defined (TA1_BASE) */
+
+ return 0;
+}
+
+static int _arm_npu_init(void)
+{
+ int err = 0;
+
+ /* If the platform has timing adapter blocks along with Ethos-U55 core
+ * block, initialise them here. */
+ if (0 != (err = _arm_npu_timing_adapter_init())) {
+ return err;
+ }
+
+ /* Initialise the IRQ */
+ _arm_npu_irq_init();
+
+ /* Initialise Ethos-U55 device */
+ const void * ethosu_base_address = (void *)(SEC_ETHOS_U55_BASE);
+
+ if (0 != (err = ethosu_init_v3(
+ ethosu_base_address, /* Ethos-U55's base address. */
+ NULL, /* Pointer to fast mem area - NULL for U55. */
+ 0, /* Fast mem region size. */
+ 1, /* Security enable. */
+ 1))) { /* Privilege enable. */
+ printf_err("failed to initalise Ethos-U55 device\n");
+ return err;
+ }
+
+ info("Ethos-U55 device initialised\n");
+
+ /* Get Ethos-U55 version */
+ struct ethosu_version version;
+ if (0 != (err = ethosu_get_version(&version))) {
+ printf_err("failed to fetch Ethos-U55 version info\n");
+ return err;
+ }
+
+ info("Ethos-U55 version info:\n");
+ info("\tArch: v%u.%u.%u\n", version.id.arch_major_rev,
+ version.id.arch_minor_rev,
+ version.id.arch_patch_rev);
+ info("\tDriver: v%u.%u.%u\n", version.id.driver_major_rev,
+ version.id.driver_minor_rev,
+ version.id.driver_patch_rev);
+ info("\tMACs/cc: %u\n", (1 << version.cfg.macs_per_cc));
+ info("\tCmd stream: v%u\n", version.cfg.cmd_stream_version);
+ info("\tSHRAM size: %u\n", version.cfg.shram_size);
+
+ return 0;
+}
+#endif /* ARM_NPU */
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